Stovepipe



C. CHAPMAN June 13, 1939.

STOVE-PIPE Filed June 27, 1938 5 web! Patented June 1 3, 1939 UNITED STATES PATENT OFFICE 2 Claims.

My invention relates to a transversely expansible pipe section, comprising a body portion having a longitudinal seam, each edge being reversely bent to form a double-looped portion with an outwardly extending free portion, the said free portion overlapping and engaging each other and a substantially V-shaped locking key adapted to enter the ends of the outer loop for adjusting and drawing the edges together, and one free portion adapted to enter the inner-loop carried by the opposite wall of the seam.

The object of my invention is to construct a length of pipe with a longitudinally extending seam composed of a reverse bent form on either side thereof, the exterior loop of which reverse bend lips will permit the introduction of a tapered staple key and the interior loops of which will receive reciprocally the sealing flaps of the lips, and whereby the amount of overlap of the sealing flaps will regulate the circumference of the pipe which will be held rigid in place by the position of the tapered staple key.

I obtain these objects in the manner illustrated in the accompanying drawing and set forth in the specification following:

Referring to the drawing:

Figure 1 is the perspective view of two sections or segments of pipe.

k Figure 2 is a plan view of the locking staple Figure 3 is an elevation of Figure 2.

Figure 4 is a section taken on line 4-4 in Figure 1.

Figure 5 is a fragmentary View of the pipe seam before assembly.

Figure 6 is a fragmentary view of the completed assembled seam.

No. IE) indicates the pipe; No. II indicates the locking staple key; No. [2 indicates the loop end of No. II; No. l3 indicates the flattened blade portions of No. II; No. l4 indicates the blade ends of No. II; No. l5 indicates the exterior loop of the reverse bend seam lip; No. I! indicates the sealing flap of the reverse bend seam lip.

The locking staple key H is constructed with a loop end l2 and two flattened blades [3 extending from each end of the loop end [2 at an acute angle with each other such that the distance between the blade ends I4 is greater in length than the chord distance of the loop end l2. The interior loops of the reverse bend seam lips l6 are constructed so as to reciprocally receive therein the sealing flaps of the seam lips I! thereby forming the circumference of the pipe segment 10; by inserting the blade ends l4 into the exterior reverse loops I5, the pipe segment Ill is held in place. Further insertion of the flattened portion of the blade ends l3 into the exterior loops l5 causes the pipe seam I! to further enter the interior loop l6, whereby the cir- 0 cumference of the pipe III is diminished. Taking one segment of pipe l0 locked and sealed so that the exterior loops l5 are abutting and the circumference thereof is at a minimum, another section or segment of pipe l0 may be affixed on the section end and on the outside thereof, and by forcing blades 13 locking staple key ll into the exterior loops l5 the circumference of the outer pipe section I0 is drawn tight and fast forming a solid friction joint. By relieving the pressure on the locking key II and by partial removal from the loops l5, the total length of the two sections of pipe in such an assembly may be regulated by the longitudinal movement of the one section of pipe within the other. 25

What I claim as new and desire to protect by Letters Patent of the United States is: p

1. A transversely expansible pipe section, cornprising a body portion having a longitudinal seam, each edge being reversely bent to form a double-looped portion with an outwardly extending free portion, said free portions overlapping and engaging each other and a locking key adapted to enter the ends of the outer loops for adjustably drawing the edges together and one free portion adapted to enter the inner loop carried by the opposite wall of the seam.

2. A transversely expansible pipe section, comprising a body portion having a longitudinal seam, each edge being reversely bent to form a double-looped portion with an outwardly extending free portion, said free portions overlapping and engaging each other and a substantially V-shaped locking key adapted to enter the ends of the outer loops for adjustably drawing the edges together and one free portion adapted to enter the inner loop carried by the opposite wall of the seam.

CHARLES CHAPMAN. 5o 

